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#!/usr/bin/env texlua

-- This program is licensed under the terms of the MIT License.
--
-- Copyright (c) 2021-2023 Munehiro Yamamoto <munepixyz@gmail.com>
--
-- Permission is hereby granted, free of charge, to any person obtaining a copy
-- of this software and associated documentation files (the "Software"), to deal
-- in the Software without restriction, including without limitation the rights
-- to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-- copies of the Software, and to permit persons to whom the Software is
-- furnished to do so, subject to the following conditions:
--
-- The above copyright notice and this permission notice shall be included in
-- all copies or substantial portions of the Software.
--
-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-- AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-- LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-- THE SOFTWARE.

if not ( #arg == 1 ) then
   print("runtexshebang 20230909 v0.3")
   print("")
   print("Usage:	runtexshebang  [input.tex]")
   os.exit(0)
end

local line_ctr = 0
for line in io.lines(arg[1]) do
   line_ctr = line_ctr + 1
   if line_ctr > 20 then break end

   if string.match(line, "^%%#!") then
      tex_cmd, err=string.gsub(line, "%%#!", "")
      tex_return = os.execute(tex_cmd)

      -- if os.execute(texcmd) returns -1 on Windows, then
      -- cmd.exe is not included in PATH, or some invalid string found before cmd.exe
      if os.type == 'windows' and tex_return == -1 then
         print("Invalid PATH setting found. Please ensure that cmd.exe can be found.\n")
         os.exit(1)
      end

      -- if not tex_return == 0 then
      --    print("TeX-style shebang processing of the below failed.\n" .. tex_cmd .. "\n")
      --    os.exit(1)
      -- end

      os.exit(0)

   -- else
   --    print("TeX-style shebang not matched.\n")
   end
end

print("TeX-style shebang not found.\n")
os.exit(2)